This rotor guide washer is an accessory for R/C-scale engines that functions as a precision spacer inside rotor stacks. It helps preserve rotor position during disassembly and reassembly, supporting consistent alignment when carrying out routine maintenance or tuning on nitro-style R/C engines.
Technicians and model builders use the washer as an alignment aid: it locates between rotor components to control end-play and maintain concentric rotation. That stabilizing effect can reduce trial-and-error when setting ignition timing or balancing the rotor during performance adjustments.
Installation notes: follow your engine's service procedure to remove the head or rotor housing, slide the washer into the rotor stack where specified, and confirm clearances against the engine's published service limits. Apply thread-lock or the correct torque only where the engine manual specifies; the washer is a passive spacer and is not a substitute for bearings or seals.
Tuning tips: after changes to carburation, ignition timing, or porting work, re-check rotor alignment. Small changes in stack height can affect rotor balance and running consistency, so treat the washer as part of your measurement and verification routine rather than a direct performance modifier.
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